Primaquine as prophylaxis for malaria for nonimmune travelers: A comparison with mefloquine and doxycycline

Malaria prophylaxis for travelers is a controversial issue. The commonly us ed regimens are associated with side effects, low compliance, or low effica cy, which have raised concern regarding their use. In addition,hey are inef ficient against the tissue stage of the parasite and thus do not prevent re lapses of Plasmodium vivax infection, Primaquine is aimed at the pre erythr ocytic stage and thus may be a potential causal-prophylactic treatment that can abolish the need for long postexposure therapy. During 1995-1998, we f ollowed retrospectively travelers who joined rafting trips to an area in Et hiopia where both P. vivax and. Plasmodium falciparum are hyperendemic, Of the 106 travelers who received primaquine, 5.7% developed malaria; of the 1 9 doxycycline recipients, 53% developed malaria; and of the 25 mefloquine r ecipients, 52% developed P. vivax malaria (greater than or equal to 3 month s after return from the area of endemicity). Primaquine was well tolerated, and only 1 withdrawal from therapy (due to gastrointestinal symptoms) was reported. Primaquine was shown to be a safe and effective prophylactic drug against both P. falciparum malaria and P. vivax malaria in travelers.